import Vue from 'vue'
import VueRouter from 'vue-router'
import login from '../components/login.vue'
import home from '../components/home.vue'
import welcome from '../components/welcome.vue'
import users from '../components/user/user.vue'

Vue.use(VueRouter)

const routes = [
  { path: '/', component: login },
  { path: '/login', component: login },
  {
    path: '/home',
    component: home,
    redirect: '/welcome',
    children: [{ path: '/welcome', component: welcome }, { path: '/users', component: users }]
  }
]

const router = new VueRouter({
  routes
})

// 挂载路由导航守卫
router.beforeEach((to, from, next) => {
  // to将要访问的路径
  // from 代表从哪个路径跳转而来
  // next是一个函数，表示放行
  // next（） 放行  next（'/login')强制跳转
  if (to.path === '/login') return next()
  // 获取token
  const tokenStr = window.sessionStorage.getItem('token')
  if (!tokenStr) return next('/login')
  next()
})

export default router
